START_AND_RUN_MOTOR_CIRCUIT

Published:2009/7/8 4:52:00 Author:May | From:SeekIC

The timed two-voltage circuit can start and run a small dc motoror solenoid．The input voltage to the LM317 three－terminal regulator ranges from 5 to 40 V, and the output voltage can range from 2 to 36 V With input voltage VIN initially applied to the input,and capacitor C1 in a discharged state,the LM393 comparator's open-collector output circuit is open-circuited,Then the higher start-up output voltage is: VOUT＝1.25[1+(R3/240)] At a time t after start-up,when: t＝-R1C1Ln[R4/(R4+R5)]or: t＝-R1C1,if R5＝1.72R4 the comparator output decreases.At that time,the output voltage switches to a lower value to run thedevice at its proper operating level.



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